Hoping to turn the millions of people with digital cameras and camera phones into photojournalists, Yahoo and Reuters are introducing a new effort to showcase photographs and video of news events submitted by the public.

Starting tomorrow, the photos and videos submitted will be placed throughout Reuters.com and Yahoo News, the most popular news Web site in the United States, according to comScore MediaMetrix. Reuters said that it would also start to distribute some of the submissions next year to the thousands of print, online and broadcast media outlets that subscribe to its news service. Reuters said it hoped to develop a service devoted entirely to user-submitted photographs and video.